Thanks for all the help, guys-
Here's my new problem. I have some brand new Kenda 28" tires, and they don't fit my 28" clincher rims. They are marked 28x 1 & 1/2, just as the old tires are, and they don't fit. As mentioned directly above ^, they fit the wheelset of a similar Raleigh I had.
The only reason I can come up with for this odd problem is that the current 28" wheels were removed from a Canadian CCM, and the tires are marked "28x 1 & 1/2, F13", which, judging by Sheldon Brown's site, is the source of problems. F13 seems to be the special Canadian mark on their 28x 1 & 1/2 tires, which aren't the same thing as the English Raleigh 28x 1 & 1/2 tires. The Raleigh 28's seem to take a tire with a 635mm ISO, whereas a Canadian CCM 28 would take a 622mm ISO. On that same note, it seems that a 28x 1 & 5/8 x 1 & 1/4 tire, or 700C, also has a 622mm ISO.
So, my question is, do my rims take 700C tires? If not, where would I get a pair of F13 Canadian 28's? Can anyone help me with these problems? Thanks in advance.